App developer, Abvio, has a robust offering of workout apps tailored specifically for the iPhone user. These apps, including Runmeter, Cyclemeter and Walkmeter which respectively track running, cycling, and walking workouts. Each of these apps track and store workout data on the iPhone itself so there is no need for users to connect to any online database to upload or download their data. This can save precious KB for the more data conscious users out there. Users can also post their workout activity to Facebook, Twitter, or dailymile.com and when friends reply to these posts, the apps will report those responses to the user in real time using text-to-speech technology. One voice is included free and other voices are available via in-app purchase for $0.99 each.

As an added bonus, Abvio has recently announced that their apps now support many of the Wahoo Fitness products. Using these monitoring device with their devices, users can track detailed stats on their heart rate and calories burned during their workouts.

Battery Go! is a mildly useful utility that determines your remaining battery life and translates it into time remaining for different activities. If it didn't rely on Apple's specs, it could actually be amazing; as it is, this one is a bit of a simplifie